The purpose of this research aims to find of the effect of each variable under research, namely the analysis of the influence of product quality, lifestyle and product design on the purchasing decisions of Eiger brand product in Purwokerto city/ this research uses quantitative research methods, non-probability sampling techniques, obtained through purposive sampling. The population in this research were studens of 4 Universities in Purwokerto like UMP, UNSOED, IAIIN and AMIKOM who bought Eiger product in Purwokerto City. This research sample was 86 respondents. The result of the analysis show that partially the quality of the product has a significant positiveeffect on purchasing decision, the result of the analysis of lifestyle partially have a positive effect on purchasing decisions and product design has no effect on purchasing decision. Furthermore, the result of the analysis simultaneously show that product quality, lifestyle and product design influence purchasing decisions.